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- Material Type
- 文書・図像類
- Author/Editor
- 中村, 啓彦
- Author Heading
- Publication, Distribution, etc.
- Alternative Title
- Mechanisms governing the winter Kuroshio path destabilization Phenomenon in the East China Sea and its interannual amplitude modulation
- Text Language Code
- jpn
- Target Audience
- 一般
- Note (General)
- 2008-2010年度科学研究費補助金(基盤研究(C))研究成果報告書 課題番号：20540428 研究代表者：中村啓彦 (鹿児島大学水産学部准教授)北部沖縄トラフの黒潮流路が冬・春期に不安定化する現象は，東シナ海上の冬季季節風に対する黒潮の局所的応答で説明できることを，理論と数値計算から示した。その応答とは，冬季季節風によって黒潮流軸の沿岸側でエクマン湧昇が起こり，黒潮が陸棚斜面から剥がされるため傾圧不安定が起りやすくなるというものである。さらに，黒潮を横切る海面地衡流速分布の長期時系列データセット（1992～2010年）を作成し，この現象の経年的な変調を調べた。その結果，主要な経年的変調の原因は，冬季季節風の強さの経年変動であることが示された。The present study investigated the mechanism responsible for the winter Kuroshio path destabilization phenomenon in the northern Okinawa Trough. Theoretical consideration and a numerical model revealed the following mechanism: The winter northerly wind over the Okinawa Trough blows against the Kuroshio, generating upwelling within the inshore side of the Kuroshio. This winter upwelling makes the mean Kuroshio path separate from the continental slope in the northern Okinawa Trough so that baroclinic instability destabilizes the Kuroshio path. Furthermore, a new time series of satellite-derived geostrophic velocity distribution was developed in a section across the Kuroshio in the period 1992–2010. This dataset indicated that the interannual amplitude modulation of the seasonality is mainly caused by interannual variation in the winter northerly wind over the northern Okinawa Trough.